Is the Schema Markup Validator free to use?

Yes, the Schema Markup Validator is completely free. No account, subscription, or signup is required — ever.

Does my data get uploaded anywhere?

No. The Schema Markup Validator runs entirely in your browser. Your data is never sent to any server.

Does it work offline?

Yes. Once the page has loaded, the tool works without an internet connection.

Which browsers are supported?

All modern browsers — Chrome, Firefox, Safari, and Edge. No plugins or extensions required.

Does this validator check schema against Google's Rich Results requirements?

It checks for common required fields and valid JSON syntax. For full Rich Results eligibility testing, also run the schema through Google's official Rich Results Test (search.google.com/test/rich-results).

What is JSON-LD structured data?

JSON-LD (JavaScript Object Notation for Linked Data) is the recommended format for embedding schema.org structured data in web pages. It is placed in a tag in the HTML head.

Schema Markup Validator

Validate and check JSON-LD schema markup for errors and warnings.

JSON-LD Schema (with or without <script> tags)

What is the Free Schema Markup Validator?

The free Schema Validator checks any JSON-LD structured data block for syntax errors and common schema.org markup issues. Paste your <script type="application/ld+json"> content into the editor and get an instant validity report — invalid JSON, missing required fields, or unrecognised property names are flagged immediately. Use it before deploying to ensure your schema passes Google's Rich Results Test.

→ Validate JSON-LD structured data before adding it to a web page.
→ Debug a schema block that is failing in Google's Rich Results Test.
→ Verify that a schema generator's output is syntactically correct JSON.
→ Check that required fields (like @type, @context, name) are present in a schema.
→ Quickly review pasted schema markup from a CMS or plugin before publishing.

How to Use the Free Schema Markup Validator

1 Paste your JSON-LD schema into the editor (the full { "@context": "https://schema.org", ... } block).
2 Validation runs instantly — syntax errors are flagged in red with line numbers.
3 Common issues like missing @context, missing @type, or invalid date formats are also reported.
4 Click Load example to see a sample valid schema for reference.
5 Fix the reported issues and paste the corrected schema back in to re-validate.

Key Features

✅
JSON syntax validation

Detects and reports JSON parse errors with specific line references.
🔍
Schema.org field checks

Warns about missing @context, @type, and other common required properties.
💡
Load example

Insert a sample valid JSON-LD schema to see the expected structure.
🔒
Private & local

Schema data never leaves your browser — all validation is client-side.

Example Usage

Example Input

{
  "@context": "https://schema.org",
  "@type": "FAQPage",
  "mainEntity": [
    {
      "@type": "Question",
      "name": "Is this tool free?",
      "acceptedAnswer": { "@type": "Answer", "text": "Yes." }
    }
  ]
}

Example Output

✅ Valid JSON-LD — no errors found.

Frequently Asked Questions about the Free Schema Markup Validator

What is the free Schema Markup Validator?: Validate and check JSON-LD schema markup for errors and warnings.
Is the Schema Markup Validator free to use?: Yes, the Schema Markup Validator is completely free. No account, subscription, or signup is required — ever.
Does my data get uploaded anywhere?: No. The Schema Markup Validator runs entirely in your browser. Your data is never sent to any server.
Does it work offline?: Yes. Once the page has loaded, the tool works without an internet connection.
Which browsers are supported?: All modern browsers — Chrome, Firefox, Safari, and Edge. No plugins or extensions required.
Does this validator check schema against Google's Rich Results requirements?: It checks for common required fields and valid JSON syntax. For full Rich Results eligibility testing, also run the schema through Google's official Rich Results Test (search.google.com/test/rich-results).
What is JSON-LD structured data?: JSON-LD (JavaScript Object Notation for Linked Data) is the recommended format for embedding schema.org structured data in web pages. It is placed in a <script type="application/ld+json"> tag in the HTML head.